36 NORTH AMERICAN THYSANOPTERA. 



long spines except on last three segments. Eighth abdominal seg- 

 ment of males covered with many long hairs. 



Described from four females and ten males. 



Habitat: Phoenb:, Ariz., type specimens collected and forwarded 

 by Mr. J. Eliot Coit; California, specimens collected by Mr. B, B. 

 Whitney at Oroville. 



Food 2)lants: Orange and olive blossoms in Arizona; Rhamnus 

 pursldana in California. 



The larva of this species is uniformly light brownish-yellow and 

 has conspicuous red pigment bands across the dorsal plates of meso- 

 thoracic and metathoracic segments and all segments of abdomen. 

 (13) Thrips magnus new species. (PL II, figs. 10, 11.) 



Measurements: Head, length 0.13 mm., width 0.18 mm.; pro tho- 

 rax, length 0.16 mm., width 0.23 mm.; mesothorax, width 0.35 mm.; 

 abdomen, width 0.40 mm.; total body, length 1.70 mm. Antennae: 

 1, 24 fi; 2, 36 /i; 3, 56 /x; 4, 51 fx; 5, 42 fi] 6, 54 n; 7, 24 n; total length 

 0.30 mm. 



General color very dark brown, head blackish brown. 



Head considerably wider than long, broadest near back; cheeks 

 very slightly arched, roughened; front of head broadly rounded; back 

 of head transversely striate. A small spine on front of each posterior 

 ocellus and a row of several smaller spines back of each eye. Eyes 

 large, occupying about two-thirds the width of the head, not unusually 

 protruding, pilose. Ocelli subapproximate, with dark-brown cres- 

 cents. Moutli-cone short, reaching hardly past middle of prothorax, 

 pointed; maxillary palpi three-segmented; labial palpi two-seg- 

 mented. Antennse seven-segmented, slightly more than twice as long 

 as head, uniform dark brown, with segments 1 and 2 often blackish- 

 brown; forked sense cones on dorsal side of segment 3 and ventral 

 side of segment 4. 



Protliorax somewhat larger than head, all angles rounded; two long 

 prominent spines on each posterior angle, several smaller ones along 

 posterior margin, the inner one being the longest ; other spines present 

 but not conspicuous. Mesotliorax largest, sides of ytertliorax broadly 

 and evenly rounded. Legs dark brown, tips of tibiae and tarsi shad- 

 ing to lighter or yellowish brown; liind tibise alone armed with 

 spines. Wings present; fore wing large, uniform brown, with spines 

 arranged as follows: Costa, thirty-one; fore longitudinal vein with 

 eight at base and three scattered on outer half; hind vein with 

 thirteen. 



Abdomen subovate, third and fourth segments largest; longest 

 spines on last two segments. 



Described from numerous females. Males much larger. 



Habitat: Visalia, Coyote, and San Francisco, Cal. 



Food ]jlant: Mimulus sp. 



